Shift control method for multi-stage motor

Abstract

The invention provides a gearshift control method for multi-gear motors. The method comprises the following steps: setting a plurality of speed gears, at least including a first speed gear and a second speed gear on an automatic gear switch, wherein the rotational speed value of a motor corresponding to the first speed gear is less than that of the motor corresponding to the second speed gear; placing the automatic gear switch in the first speed gear; confirming that a gear-selecting unit is in an automatic gear state; starting automatic gearshift function; and automatically regulating the rotational speed of the motor according to the load changes of the motor. The method also comprises the steps of confirming that the gear-selecting unit is in a low gear state, starting the function of running at uniform speed and placing or keeping the automatic gear switch in a preset speed gear. The gearshift control method for multi-gear motors has the advantages of adopting an electronic clutch mode, producing no arc during automatic gearshift, effectively solving the damage of arc to the automatic switch and automatically switching the gears of the motor according to the load changes.

Description

Technical field [0001] The invention relates to a motor shift control method, in particular to a multi-speed motor shift control method that can be used for star-connected multi-speed motor windings or series-excited motor field coil windings of electric vehicles. Background technique [0002] At present, electric bicycles are widely used, and single-speed motors used in electric bicycles often cannot balance speed and torque with each other. The shifting of motor windings mostly uses automatic switches, which are mainly composed of contactors and relays. Due to the electrical characteristics of the automatic switches themselves, arcing will occur during the electrified switching process, which is likely to cause damage to the automatic switches. There are also some arc extinguishing methods and products, which mainly use non-contact relays and vacuum arc extinguishing devices. These devices cannot be widely used due to the complicated manufacturing process, the difficulty of gua...

AI Technical Summary

Problems solved by technology

Such an electric vehicle will appear to guarantee the maximum torque output for climbing while ensuring high-speed operation on a flat road.

[0004] In addition, automatic switches are mostly used for gear shifting of motor windings. Automatic switches are mainly composed of contactors and relays. Due to the electrical characteristics of automatic switches themselves, arcing will occur during live switching, which may easily cause damage to automatic switches.

There are also some arc extinguishing methods and products, which mainly use non-contact relays and vacuum arc extinguishing devices. These devices cannot be widely used due to the complexity of the manufacturing process, difficulty in ensuring the vacuum environment, and high cost.

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